Balance Sheet
| Concept | As at 2024-12-31 | As at 2024-06-30 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                984,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                56,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                9,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                1,012,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                533,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise | 
                                                490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -18,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -18,756,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                2,617,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,031,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                51,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,528,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,571,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                2,651,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,694,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,202,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,202,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets, net | 
                                                43,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                49,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Intangible assets | 
                                                213,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                227,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Goodwill | 
                                                143,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                156,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                64,156,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                5,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                663,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                649,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investment securities | 
                                                74,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                24,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Guarantee deposits | 
                                                71,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                307,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                206,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -37,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -37,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Own-used assets | ||
| Leased assets | — | — | 
| Intangible assets | ||
| Other intangible assets | ||
| Investments and other assets | ||
| Investments in capital of subsidiaries and associates | 
                                                15,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | ||
| Assets | 
                                                6,145,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,602,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | — | — | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                1,298,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,415,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Bonds payable | 
                                                54,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                669,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                702,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                11,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                26,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                14,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,484,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,754,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                1,250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                237,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                267,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accrued expenses | 
                                                100,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                308,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                27,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                84,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                104,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,783,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,169,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                2,223,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,325,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                885,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                870,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                834,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                819,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                504,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                635,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                3,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                1,036,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                26,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,362,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,432,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                6,145,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,602,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Current portion of bonds payable | 
                                                36,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                22,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                126,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                131,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Contract liabilities | 
                                                479,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                84,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                712,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Non-current liabilities | ||
| Provision for retirement benefits for directors (and other officers) | 
                                                4,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Valuation and translation adjustments | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |